hondakawasaki
Nova Slayer
Joined: 03 Jan 2013
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 Posted: 01:07 - 28 Apr 2013  Post subject: cg 125 sprockets |
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hi all 
will be buying a chain and sprockets for my cg 1991 brazill
just wondering are all cg sprockets the same? will say a set of 2006 sprockets fit on my 1991
also what size sprockets do you guys use? i have 14/42 if i remember correctly i can do 67mph on a long enough straight did 70 down a long hill once
i was thinking of going 1 tooth down on the back sprocket to get an extra mph or 2 
thanks for reading  |
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Paddy Blake
World Chat Champion
Joined: 29 Jun 2006
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| Posted: 02:01 - 28 Apr 2013 Post subject: Re: cg 125 sprockets |
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| hondakawasaki wrote: | hi all
will be buying a chain and sprockets for my cg 1991 brazill
just wondering are all cg sprockets the same? will say a set of 2006 sprockets fit on my 1991
also what size sprockets do you guys use? i have 14/42 if i remember correctly i can do 67mph on a long enough straight did 70 down a long hill once
i was thinking of going 1 tooth down on the back sprocket to get an extra mph or 2
thanks for reading |
If you want to go faster get a faster bike.
For parts go to wemoto.
https://www.wemoto.com/bikes/Honda/ |
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stuarthouston
Trackday Trickster
Joined: 31 Mar 2012
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tahrey
World Chat Champion
Joined: 07 Jul 2010
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| Posted: 10:36 - 18 Oct 2013 Post subject: |
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| stuarthouston wrote: | As above, check out WeMoto for the parts. By the look of it, standard for your bike is 14/41. That's what I have on mine I think, and it's 'fine'. Just have to remember it's a CG, and will never be fast.
When I bought mine, it was two teeth down on the front, (for acceleration, innit) but all it really achieved was making it scream its lungs off at low speed. I'd imagine going the other way would have similarly neligible effect on real life performance. |
Jeez. If yours was originally 14t upfront, that's almost the equivalent of the difference between 4th and 5th gear. Sustained speeds above 50mph must have been... interesting... to say the least.
The gearing down for acceleration thing is a load of hokum so long as your spread of internal box ratios is well sorted and first gear is low enough for you to get a good launch already. Once you're out of first you'll be bouncing up and down the powerband in the exact same way you would with higher gearing, except you'll be changing gear more often. If you're finding that the engine's dropping out of the usable powerband, then changing the chain gearing is little more than a bodge and you need to look at either the tuning or the gearbox itself.
All it actually does is alter the gear ranges, so you can e.g. hold a numerically higher gear (NB, that doesn't automatically = more speed for less revs than a longer legged bike would have in a numerically lower gear) for longer when going up a steep hill, which may be worth it if you often ride a particular route and find that, say, 4th is just a little too high to make it all the way up, but 3rd is way too short for comfort (or vice versa). Or you regularly ride with a pillion and luggage and have to go over difficult terrain so having a choice of several low gears is more important than on-the-flat acceleration or ultimate top speed (I'm pretty sure this is the angle car makers go for when they do things like sell 1-litre hatches with five gears, none of which are higher, in real terms, than third on my 1.5 diesel, but the thing still doesn't sprint from 0-100 in less time than a longer-geared 4-speed did).
It's much more critical on a small bike to make sure top gear is sorted properly (or if you're blessed enough to have 6 moderately wide gears... fifth ), so peak power comes in at about max speed in still air, so it neither lags badly unless you have a tailwind, nor ends up screaming on the redline at a lower speed than it's ultimately capable of.
(Again, so long as this doesn't ruin first and your in-between ratios are well aligned, which is something Honda seem reasonably good at; the exact assortment between my original CG bottom end and the replacement XR one are a bit different (tighter 1-2 on the XR, for example), but neither are particularly "bad". If it was practical to swap cogs between the two, I could actually make a damn near perfect one...)
I'm angling for a slightly higher 5th than the CG originally had, because it tended to end up revving its nuts off in the high 60s originally, seemingly with more left to give, and there wasn't any shortage of pull in 1st so long as I remembered to be progressive with the throttle and let it rev up a little first... I doubt it'll make any measurable difference to either the 0-60 or even 0-30 time... |
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stuarthouston
Trackday Trickster
Joined: 31 Mar 2012
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tahrey
World Chat Champion
Joined: 07 Jul 2010
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